Nut-lock



(No Model.)

D: P. PRESCOTT.

NUT 1.00K. y No.25zi295. Patented Jan.10,1882,.=

- VIIIIIIIA' VIII/IIIA DANIEL l?. PRESOOIT, OF VERNON, VVERMONT,ASSIGNOR OF ONE-HALF TO -MARCUS M. BEEMAN, OF SYURAOUSE, NEW YORK.

NUT-LOCK.

, SPECIFICATION forming-'part of Letters Patent No. 252,295, datedJanuary 10, 1882.

"application inea september 6,1881. (Nd model.)

To altwho'm it may` concern:

Be it known that I, DANIEL P. Pansoorr, a citizen ot' the United States, residing at Vernon, in the county of Windham and State of Vermont, have invented new and useful Improvements in N uta-Locks, of which the following is a specification.

This-invention relates to the construction of an improved nut-lock adapted to both iron and wood Work, and towashers'to be used with said nut-locks under certain circumstances, the object being to provide a strong and surely-fastenin g nut-lock, which can be elfectuall y secured to an iron seat against turning back by the use of such tools as mechanics are usually supplied with, and can, by theuse ofthe same tools, be so freed as to be easily removed from its bolt, and which can, with suitable washers, be posiy tively secured against unscrewing when used fication, Figure 1 is a perspective view ot' the under side of a'nut provided with locking .de-

' vices constructed according to my invention.

Fig. 2 is a plan v'iew ofthe under side ot' said nut. Fig. 3 is a-side elevation of said nut and alwasher, the latter being shown in section. Fig. 4 isa perspective of the upper and Fig. 5 ofthe underside of the washer,` Fig. Gis a viewof the spring-pawl removed from the nut, and Fig. 7 is a side elevation of a section ota rail-joint having said nuts thereon. i In the drawings, Ais the nut. eisn the springpawl. c is the washer. b is the section of a rail. d is thejointplate.

In constructing myimproved nut-lock I make the spring-pawleot' steel or other suitable wire,

bending it in the form shown, thereby providing a short arm, e?, standing at, or nearly at, right angles to its longer curved body e3, the general form of said body being veryclearly` shown in Fig. 1.

'llo adapt the nut A to receive in its under face said spring-pawl e, said nut is bored in a vertical' direction on Vits under side to receive the arm c2 of the spring-pawl, and from one side ot' the hole bored to receive said arm' a curved channel is formed, leading from said hole to one side of thenut, one-quarter around themlattei-,ot sufficient depth to receive within it the curved arm e3 of said spring-pawl, into which the latter is driven, taking the positionV from the bottom of the groove in said nut, al-

lowing the end of said pawl more or less spring motion at that point, and said pawl is placed i in nut A in such a position that When said nut is turned onto a bolt the projecting end of said pawl will draw over the surface of` the object againstwhich the nut is screwed.- 1

Figs. 4 and 5 illustrate the washer, which is adapted to be used on certain descriptions of work with said nut-lock, as hereinafter described, said Washers c being made with grooves asonA their upper faces and with pointed studs c on their under sides.

In using my improved nut-lock on iron- Work ordinarily the washer c may often be dispensed with, as illustrated in Fig. 7. There it is shown that the nut A is screwed directly against the joint-plate d, inthe face of which', within the circle described by the end ot the pawl e, a

slight notch, o, is out with the point of a coldchisel. Thus when the nut has been rmly screwed down the end of pawl e springs into said cut or notch o and effectually prevents said nut from turning back. In some situations vvhere saidnuts are used on finished work audit is desirable not to mutilate the face' thereot', the washers c are used, and the studs e on said Washers prevent the latter from turning on the surface of the object against which they may be forced by the nut, and the endl of the pawle,fal1nginto the grooves (or one of them) on theface of said washer, as in Fig. 3prevents the uut from turning oft'. In using said nutlocks on wood-work they are used with said washers preferably in the manner just described.` To turn said nuts off, the end of a chisel or some similar thin-edged instrument is pressed under theprojecting end of the pawl e, slightly raising the end of the latter and disengaging it from a groove in washer c orfrorn the notch 0, when the nut may be easily unscrewed.`

From the fact that the end of pawl e may have more or less motion, or that the nut and the object against which it is screwed may under some circumstances slightlyT changel their relative positions Without causingl the end of said pawl to be disengaged from the groom or notch into or against which it springs constantly, it is obvious that the within-described l nut-lock possesses man y advantages over other nut-locks in use.

What I claim as my invention is- A The Within-dest ribed improved nut-lock, consistingof'the nutA, and the pawl e, said niitbe-l i5 ing provided on its under face with a single vertical sooket to receive the short arm ot' said pawl, and with a groove to receive the downwardly-inclined long 'arm thereof, reaching from said socketbeyond the sides of said nut, zo the combination andarrangement of said nut and pawl being substantially as and for the purpose set forth.

DANIEL P. PRESCOTT. 

